Fluid-filled bag-shaped container

Abstract

To improve a degree of freedom in design of a bag-shaped container which has an injection hole to inject liquid.SOLUTION: The bag-shaped container includes: a compartment junction portion 10 in which a sheet-like container material 3 having a fluid-filled chamber 7 that maintains the shape when filled with fluid and expanded is superimposed, at least the peripheral edges of the container material 3 are joined together, and the container materials 3 superimposed on each other are joined linearly to have a hollow portion 6 for containing the contents therein and form the hollow portion 6; a fold portion 9 separated from a part of the container materials 3 that becomes the outer wall portion of the hollow portion 6 by the compartment junction portion 10 and provided away from the portion that becomes the outer wall portion of the hollow portion 6; an injection hole 11 formed in a part of the container materials 3 forming the fold portion 9; and a passage 12 which goes through the compartment junction portion 10 that separates the fold portion 9 and the fluid filled chamber 7 and communicates the injection hole 11 and the fluid-filled chamber 7 and can close the fluid-filled chamber 7 in an airtight state while fluid is filled.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a bag-shaped container composed of a sheet material formed by laminating two films, and is configured to maintain a three-dimensional shape by an expansion pressure generated by pressurizing and filling a fluid such as air into a filling portion (cell) formed between the films.

Background Art

[0002] Conventionally, various containers of this type have been proposed. As an example, Patent Document 1 describes a bag-shaped container in which a plurality of air filling portions (cells) are formed in both the side wall portion and the bottom portion, and the cells can be filled with air from a single air injection hole. The container described in Patent Document 1 is formed by joining two synthetic resin films overlapped with each other by a plurality of linear seal portions intersecting in a grid shape to form a plurality of cells, and by making a part of the seal portion a non-adhesive ventilation passage, the cells are communicated with each other. A sheet made of two synthetic resin films joined in this way is used as a container material, and the container material is folded in half into a bag shape, and the folded portion is pushed into the inside of the bag so that the valley fold is reversed into a mountain fold. By doing so, two valley fold lines parallel to the mountain fold line are formed on both sides of the mountain fold line, which is the folding line where the container material is folded in half. A portion with a predetermined width sandwiched between the two valley fold lines becomes the bottom of the container. In addition, a line connecting obliquely the intersection of the side edge seal portion joining the side edge portions of the two container materials and the above-mentioned mountain fold line and a predetermined portion of the two valley fold lines joins the container materials overlapped with each other due to the mountain fold, and forms a triangular gusset portion. The gusset portion is a portion generated by a process for stabilizing the shape, and even if there are cells inside, air is not filled.

[0003] Each cell formed in the above-mentioned bottom and side wall parts (peripheral wall parts) communicates with each other because a part of the seal part partitioning these cells is non-adhesive. An injection hole communicating with one of these cells is formed. Specifically, the upper edge part on the side opposite to the above-mentioned bottom is a part where the edge parts of the double-folded container material are overlapped, and a spout is fitted and joined to this upper edge part. The injection hole is formed at the corner part on the upper edge part side with one side edge part. This injection hole is a hole opened in one of the two synthetic resin sheets constituting the cell, and the cell in which this injection hole is opened has a different shape from the cells formed in the side wall part and the bottom part. This is because it is not a cell filled with air and inflated. A ventilation path extending linearly along the side edge part from that cell toward other cells is formed between the two synthetic resin films constituting the cell in which the injection hole is opened. After injecting air from the injection hole into each cell, a part of the ventilation path closes by welding the synthetic resin films to each other, so that each cell in the side wall part and the bottom part is blocked from the outside and maintains a state of swelling with air pressure.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above-described conventional container, an injection hole is provided at a corner portion surrounded by an upper edge portion and one side edge portion obtained by folding a sheet-like container material in half into a bag shape. Since this injection hole is an essential part of the container structure, when the overall contour of the container is made into a so-called rounded shape, or a shape where the so-called shoulder gently curves, or a tapered spire shape, etc., the injection hole becomes an obstacle and it becomes difficult to adopt such a shape, and the degree of freedom in design is impaired by the injection hole. Also, in the configuration of the conventional container, the injection hole is provided in the above-described corner portion, and since that corner portion is part of the appearance of the container, that is, part of the side wall portion (peripheral wall portion), the injection hole is provided at a location that forms the appearance of the container. And the portion of the injection hole (the cell where the injection hole is open) remains in a thin sheet shape without being filled with air, so its shape is significantly different compared to the cells on the other side edge portion side being inflated by air. That is, the left-right symmetry as a container is impaired, and depending on the type of content, it becomes a container that is difficult to adopt or a container with limited uses, etc., and there was room for improvement.

[0006] This invention has been made paying attention to the above-described technical problems, and an object thereof is to provide a bag-shaped container excellent in the degree of freedom in design.

Means for Solving the Problems

[0007] To achieve the above object, this invention has a fluid filling chamber that maintains its shape by being filled with and inflated by a fluid a device formed by laminating films A three-dimensional structure in which sheet-like container materials are overlapped and at least the peripheral edges of the overlapped container materials are joined to each other to have a hollow portion inside for accommodating the content, a fluid-filled bag-shaped container , comprising A partition joint portion that linearly joins the container materials overlapped with each other so as to form the hollow portion, and a pleat portion provided separately from the portion that becomes the outer wall portion of the hollow portion among the container materials and separated from the portion that becomes the outer wall portion of the hollow portion by the partition joint portion , at the central part of the fold part, a closed non-adhesive part formed by making the laminated films non-adhesive, and on one of the laminated films forming the fold part, a pouring part formed by opening the non-adhesive part An inlet hole, and through the partition joint portion that partitions the pleat portion and the fluid filling chamberconnected to the marked non-adhesive part It is characterized by including a passage that is continuous and hermetically closed in a state where the fluid filling chamber is filled with the fluid.

[0008] In this invention, the container material includes a first sheet portion and a second sheet portion each having the fluid filling chamber and facing each other. A part of the peripheral portion of at least one of the first sheet portion and the second sheet portion is bent at a predetermined position on the peripheral edge of one of the sheet portions as a bending point and convex outward from the hollow portion at the bending point. The portions of a predetermined length on both sides of the peripheral edge sandwiching the bending point are aligned and joined to each other. A part of the peripheral portion is joined along a line connecting a portion of a predetermined length from the bending point at a position on the bending line passing through the bending point and the joined portion of the predetermined length, and the joined portion along the line becomes the partition joint portion, and the pleat portion may be formed.

[0009] Also, in this invention, the first sheet portion is formed by one half of the folded container material, and the second sheet portion is formed by the other half. A bending point is provided at a position a predetermined length away from the bottom-side apex portion, which is the folded portion of the container material, among the peripheral edges of the first sheet portion and the second sheet portion. The portions of the length from both sides of the bending point to the bottom-side apex portion are the portions of the predetermined length. The joined portion along the line connecting the bottom-side apex portion and the portion of the predetermined length on the bending line passing through each bending point in the first sheet portion and the second sheet portion becomes the partition joint portion, and the pleat portion is formed by the partition joint portion, the bending line, and the peripheral edge. A portion partitioned by the line connecting the intersection points of the partition joint portion and the bending line in the first sheet portion and the second sheet portion and each bending line as four sides may constitute the bottom surface portion.

Advantages of the Invention

[0010] According to the present invention, the hollow portion for accommodating the contents is partitioned by partition joints, and the contour shape of the hollow portion substantially determines the shape of the product as a whole, which is a container for accommodating the contents. On the other hand, the injection hole for injecting a fluid such as air into the fluid filling chamber is provided in the fold portion connected to the outside of the partition joint that partitions the hollow portion. Therefore, even if the injection hole is an essential component, the fold portion provided with the injection hole does not become a portion that determines the shape or contour of the container as a whole by folding or the like. Therefore, providing the injection hole hardly restricts the design of the container shape or contour. That is, in the configuration of the container according to the present invention, the degree of freedom in the design of the container can be improved.

[0011] In addition, since the injection hole does not particularly restrict the shape of the container, the left-right symmetry or up-down symmetry of the overall shape can be easily maintained.

[0012] In particular, when providing the above-described fold portion in order to form a three-dimensional shape with a superimposed sheet-like container material, an injection hole may be formed in the fold portion, so that the effective use of the fold portion can be achieved. In other words, since it is not necessary to separately provide a special fold portion for the injection hole, simplification of the overall structure, manufacturing process, etc. can be achieved.

Brief Description of the Drawings

[0013]

Figure 1

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Figure 13

Embodiments for Carrying Out the Invention

[0014] FIGS. 1 and 2 show a container 1 according to the present invention, and FIG. 3 shows a state where a pump type extrusion device 2 is attached after filling the container 1 with contents to make a product. The container 1 shown here is formed in a bag shape by a sheet-like container material 3, and a spout 4 is attached to the upper end edge portion. The spout 4 is attached to the main body portion 5 forming the bag shape of the container 1 by being sandwiched by the container material 3 and welded to each other. And the pump type extrusion device 2 is attached to the spout 4. Note that the pump type extrusion device 2 includes a cap 2a fitted to the spout 4 with a screw and a nozzle portion 2b connected to a pump (not shown) and capable of being pushed down with respect to the cap 2a.

[0015] The main body part 5 is configured by overlapping the container material 3 so as to form a hollow part 6 with a predetermined volume for accommodating a predetermined liquid content such as cosmetics or beverages, and joining their peripheral parts to each other. The container material 3 may be overlapped by two sheets, or one sheet of the container material 3 may be folded in half and overlapped. If it is configured to fold one sheet of the container material 3 in half and overlap it, the number of joining portions is reduced, so that the configuration or manufacturing process of the container 1 is simplified accordingly, and the degree of freedom in design is increased.

[0016] The container material 3 is configured by laminating two films 3a and 3b. As shown in FIG. 4, appropriately formed are closed portions where these films 3a and 3b are not adhered, and the non-adhered portions serve as fluid filling chambers (hereinafter referred to as cells) 7 for filling fluids such as air.

[0017] These films 3a and 3b can have an appropriate configuration. To explain an example, the film 3a that constitutes the inner surface of the container 1 includes, for example, an adhesive layer heat-bonded to the other film 3b that constitutes the outer surface of the container 1, a barrier layer configured to suppress gas permeation, and an inner layer disposed on the innermost side of the container and touching the contents. A laminated film in which these layers are laminated can be employed. The adhesive layer is preferably composed of a resin film having heat-sealability. As the adhesive layer, for example, resin films such as polyolefin-based resins and polyester-based resins can be used. Among these resin films, in particular, a film made of a linear low-density polyethylene-based resin (hereinafter referred to as LLDPE) is preferably used. The barrier layer is, for example, one that suppresses the permeation of oxygen, water vapor, fragrance substances, etc., and can be constituted by a resin film or a coating film having oxygen barrier properties with a lower oxygen gas permeability than other gases. When the barrier layer is constituted by a coating film, a paint mainly composed of a synthetic resin material that is difficult to permeate oxygen and water vapor is applied to the adhesive layer or the inner layer, and then dried to form it. Examples of the resin film and the synthetic resin material that constitute the barrier layer include ethylene-vinyl alcohol copolymers. As the inner layer, similar to the adhesive layer, it is preferable to use a resin film having heat-sealability such as polyolefin-based resins and polyester-based resins. In particular, it is preferable to use a film made of LLDPE.

[0018] As the other film 3b constituting the outer surface of the container 1, a film formed by laminating a base material layer as a base and an outer layer disposed on the outermost side of the container can be adopted. The base material layer is, for example, thermally adhered to the film 3a on the inner surface side and is composed of a resin film having heat sealability. As the base material layer, similar to the adhesive layer, resin films such as polyolefin-based resins and polyester-based resins can be used, and in particular, it is preferable to use a film made of LLDPE. If a film made of LLDPE is used, compared with the case of using other films, the thermal adhesion between the base material layer and the adhesive layer can be easily performed, and the adhesion strength between the base material layer and the adhesive layer can be improved. As the outer layer, for example, it is preferable to use resin films such as polyamide-based resins, polyolefin-based resins, and polyester-based resins, and in particular, it is preferable to use a film made of nylon (registered trademark) resin.

[0019] In the container 1 shown in FIGS. 1 to 3, a single container material 3 is folded and overlapped, and in that state, the peripheral portions are joined to each other, or the spout 4 described above is sandwiched and joined, whereby a bag-shaped main body portion 5 is formed. Among the container materials 3, the portion that is folded in half and forms one outer wall portion of the main body portion 5 becomes the first sheet portion 5a in the present invention, and the other portion becomes the second sheet portion 5b in the present invention. The boundary portion between these first sheet portion 5a and second sheet portion 5b is a bottom equivalent portion 5c having a predetermined width. In other words, the portions on both sides of the double fold line L1 obtained by folding the container material 3 in half are the bottom equivalent portion 5c. The double fold line L1 is shown by a broken line in FIG. 1. By filling the contents, the first sheet portion 5a and the second sheet portion 5b expand so as to be separated from each other, and the bottom equivalent portion 5c extends with the double fold line L1 at the center, and a bottom surface portion having a predetermined width (width) is formed.

[0020] In the container 1 shown in FIGS. 1 to 3, the cells 7 are formed in a U-shape in each of the sheet portions 5a and 5b. That is, the peripheral portions of the respective films 3a and 3b that make up the container material 3 and are laminated on each other are joined (welded) with a predetermined width, and the outer peripheral shape of the cell 7 is determined by the linear outer joint portion 8a. Further, an inner joint portion (weld portion) 8b having a shape substantially similar to the contour shape of each of the sheet portions 5a and 5b is provided at the center of each of the sheet portions 5a and 5b, and the respective films 3a and 3b are joined (welded) at this inner joint portion 8b. The portion partitioned by these outer joint portions 8a and inner joint portions 8b is a cell 7 into which a fluid such as air is injected and inflated, and maintains its form by the pressure. Note that the portion surrounded by the inner joint portion 8b is in a hollow shape surrounded by the respective films 3a and 3b because the respective films 3a and 3b are not joined, and since the inner joint portion 8b is in a closed shape, no fluid such as air enters or exits the hollow portion. When each of the sheet portions 5a and 5b is in a stretched state, the central portion F of each of the sheet portions 5a and 5b becomes a smooth surface close to being flat.

[0021] Regarding the shape of the container 1 as a whole, by making the corner portions of the container material 3 into a circular arc shape (R shape) with a large radius, the so-called shoulders of the container 1 have a smooth rounded shape. The lower corner portions of each of the sheet portions 5a and 5b are configured to have a rounded shape so as to balance with this rounded shoulder. As described above, the bottom equivalent portion 5c is providedThe cell 7 is configured to have a bottom surface of a predetermined width, and the cell 7 expands with the lower part of the container 1 expanding according to the bottom-equivalent part 5c. The shape of the cell 7 expanded in this way becomes the overall shape of the container 1, or the shape that gives the container 1 an impression. Therefore, in the example shown in Figs. 1 to 3, the shape of the lower corner of the cell 7 in the expanded state is a rounded shape similar to a shoulder. Such a shape is created by joining (welding) the films 3a, 3b and the sheet parts 5a, 5b that are joined to each other at the right-angled left and right corners created by folding a single container material along an oblique line so as to define a substantially triangular pleat part 9. The oblique linear joint (welded part) corresponds to the partition joint part 10 in this invention. Therefore, the cell 7 has a shape that is partitioned by the outer joint part 8a, the inner joint part 8b, and the partition joint part 10 described above for each sheet part 5a, 5b (each outer wall part). 1 to 3, it is U-shaped. Moreover, not only the films 3a, 3b but also the sheet portions 5a, 5b are linearly joined at the outer joint portion 8a and the partition joint portion 10, so that the hollow portion 6 to be filled with the contents has an overall rounded shape defined by the outer joint portion 8a and the partition joint portion 10.

[0022] Therefore, the pleats 9 are thin pieces formed outside the cells 7 and hollow portions 6, and are provided symmetrically in the example shown in Figures 1 to 3. The pleats 9 are provided on both the first sheet portion 5a and the second sheet portion 5b, so that a total of four pleats 9 are provided in the example shown in Figures 1 to 3. An injection hole 11 and a passage 12 are formed in one of the pleats 9.

[0023] These injection holes 11 and passages 12 are parts for injecting fluid (specifically air) into the above-described cell 7. The pleat portion 9 is a portion where the outer peripheral portion is joined in a triangular shape as described above. Therefore, the central portion thereof is a non-adhesive portion 9a where the films 3a and 3b are separated. The injection hole 11 that opens into the non-adhesive portion 9a is formed in one of the films 3b (for example, the outer film). Further, a passage 12 is formed in the partition joint portion 10 that partitions the pleat portion 9 provided with the non-adhesive portion 9a where the injection hole 11 opens from the cell 7. This passage 12 is a portion where, when the films 3a and 3b are linearly joined (welded) at the partition joint portion 10, a part thereof is not joined and the non-adhesive portion 9a is communicated with the cell 7. In a state where the cell 7 is sufficiently filled with air, the passage 12 is closed in an airtight state by welding.

[0024] As described above, in the container 1 according to the present invention, the injection holes 11, the passages 12, etc., which are essential for filling the cell 7 with fluid, are provided in the pleat portion 9 generated when determining the shape of the hollow portion 6 for filling the shape and contents of the entire container 1. Therefore, the injection holes 11, the passages 12, etc. do not become factors that restrict the design of the container 1, and a container 1 with a high degree of design freedom can be obtained. In particular, since the pleat portion 9 is a portion generated when the shape of the entire container 1 is made symmetric left and right or symmetric front and back, the pleat portion 9 is also generated symmetrically left and right or front and back with respect to the container 1. Therefore, it is possible to avoid the pleat portion 9 from inhibiting the symmetry of the shape of the entire container 1, and in this regard, the overall design or its degree of freedom can be improved.

[0025] Next, the configuration of the above-described container 1 will be described in more detail according to its manufacturing procedure. FIG. 5 shows the container material 3, and the container material 3 shown here is in a state where the rolled films 3a and 3b are pulled out from the roll and overlapped (laminated) with each other. The portion partitioned by a straight line in FIG. 5 corresponds to one container 1, and the injection hole 11 is formed at a predetermined position by punching or the like.

[0026] A linear joint (seal) that partitions the aforementioned cells 7 and non-bonded portions 9a is provided at a portion corresponding to one container 1 on the tip side of the container material 3. An example thereof is shown in FIG. 6, where it is linearly joined along the outer peripheral edge of the portion corresponding to one container 1, and this substantially rectangular joint portion corresponds to the aforementioned outer joint portion 8a. Also, the aforementioned inner joint portion 8b is set at the center of each of the upper and lower portions in FIG. 6 where the portion corresponding to one container 1 is divided by the double-fold line L1, and it is joined in a U shape by this inner joint portion 8b. Therefore, a U-shaped cell 7 is formed that surrounds a central portion F that becomes a substantially flat surface by not filling it with air.

[0027] At the portion corresponding to the bottom equivalent portion 5c described above in the central portion of the rectangular portion corresponding to one container 1 of the container material 3, a flat portion 13 is provided that maintains a flat state by not filling it with air. In the example shown in FIG. 6, this flat portion 13 is composed of four triangular portions arranged radially around the center point of the portion corresponding to one container 1, and each triangular portion may be either a portion formed by welding on three sides or a portion formed by welding on a triangular surface. These four triangular flat portions 13 are sized to fit within the bottom equivalent portions 5c of a predetermined width on both sides sandwiching the double-fold line L1.

[0028] Also, the left and right triangular flat portions 13 in FIG. 6 are connected to the outer joint portion 8a by a linear welded portion 14 that reaches the outer joint portion 8a at the left and right side edges. This linear welded portion 14 is a portion where the respective films 3a, 3b are linearly welded along the aforementioned double-fold line L1. Since the container material 3 is bent along this double-fold line L1 as will be described later, if the linear welded portion 14 has a certain width, a linear non-welded portion may be provided inside it to facilitate the bending of the container material 3.

[0029] The bottom partition welding part 15 is provided so as to be orthogonal to this linear welding part 14. This bottom partition welding part 15 is a part where the respective films 3a, 3b are linearly welded, and two are formed at a predetermined interval in the width direction from the central part of the container material 3. That is, the part between these two bottom partition welding parts 15 bulges downward of the container 1 to form the bottom surface of the container 1. Therefore, the bottom partition welding part 15 is for defining the bottom surface, and its length is substantially the same as the width of the bottom surface. And the peripheral part (lower part) of the container material 3 is bent by a line L2 connecting the tips of the respective bottom partition welding parts 15 on each of the sheet parts 5a, 5b sides, one becomes the first sheet part 5a or the second sheet part 5b, and the other becomes the bottom surface. Therefore, this line L2 corresponds to the "bending line" in this invention, and the intersection point Pc between the bending line L2 and the outer joint part 8a corresponds to the "bending point" in this invention. This bending point, in other words, is the intersection point between the above-mentioned double-fold line L1 and the outer joint part 8a as the bottom-side vertex part in this invention, and is a point separated by a predetermined dimension from both sides of the bottom-side vertex part.

[0030] Furthermore, on the outer joint part 8a, the respective films 3a, 3b are welded by a line (straight line or curve) connecting a position separated by a predetermined dimension from the above-mentioned bending point Pc to the upper and lower end sides and the tip part of the bottom partition welding part 15, and this linear welding part becomes the above-mentioned partition joint part 10. The injection hole 11 described above opens in any one of the non-adhesive parts 9a separated from the cell 7 by the partition joint part 10, that is, the outer part of the partition joint part 10. And the passage 12 described above is formed in the partition joint part 10 partitioning the non-adhesive part 9a where the injection hole 11 opens and the cell 7.

[0031] Next, a notch 16 is formed to expose the base material layer in the film 3b that constitutes the outer surface of the container 1. As shown in FIG. 7, at a location in the outer joint 8a close to the above-described double fold line L1, the film 3a that constitutes the inner surface of the container 1 is cut out (punched) in a circular shape, for example, to form the notch 16. When the container material 3 is mountain-folded along the double fold line L1 (folded so as to be convex toward the inside of the container 1) and valley-folded along the above-described fold line L2 (folded so as to be convex toward the lower side of the container 1), the notch 16 is provided at a position that overlaps the outer joint 8a at a location symmetric about the fold line L2. Therefore, the base material layer is exposed at the notch 16 at the overlapping location thus formed. Since the base material layer has the same composition as the adhesive layer in the other film 3a, the exposed portion of the base material layer functions as a heat-bondable adhesive layer.

[0032] Thereafter, the container material 3 is mountain-folded along the above-described double fold line L1 and valley-folded along each of the fold lines L2 on both sides thereof. This state is schematically shown in FIG. 8 as a perspective view. When the container material 3 is folded in this way, at the locations where mountain-folding and valley-folding are performed, that is, at the locations close to the bottom as the container 1, two overlapping portions are stacked on top of each other to form a four-layer stack, and above that, a two-layer stack is formed. In this state, first, among the two-layer stack portions, the above-described diagonal partition joint 10, a part of the outer joint 8a that forms a triangular shape together with the partition joint 10, and the portion along the above-described fold line L2 that forms the above-described triangular shape are welded linearly. The welded triangular locations are shown hatched in FIG. 9. In this case, the films 3a that constitute the inner surface of the container 1 face and contact each other, and as described above, the contact surface has heat-sealability similar to the adhesive layer, so the sheet portions 5a and 5b that overlap and contact each other on the inner surface side with the film 3a are heat-welded. In this way, four pleat portions 9 are formed. In that case, the portion of the partition joint 10 that becomes the above-described passage 12 is left in a state of passing through the partition joint 10 without being adhered so as to communicate the cell 7 and the non-adhesive portion 9a inside the pleat portion 9.

[0033] Next, the entire portion of the outer joint 8a that is double - layered at the left and right side edges of the container 1 is linearly welded. The welded portion is shown hatched in FIG. 10. In this case, in the pleat portion 9, since the base material layer is exposed at the notch portion 16 provided at the location corresponding to the side of the triangular portion described above, the side edges of the pleat portions 9 that are overlapped with each other are joined by the base material layer. That is, the two pleat portions 9 on the left and right sides of the container 1 are in a closed state. This is to avoid the pleat portion 9 extending out without coherence when the portion corresponding to the bottom surface of the container 1 is expanded in the thickness direction of the container material 3 (the direction perpendicular to the plane of FIG. 9).

[0034] After the joining (welding) of each film 3a, 3b and sheet portions 5a, 5b is completed as described above, trimming is performed to adjust the contour of the container 1. Specifically, as shown in FIG. 11, the corner portions of the rectangular portion corresponding to one container 1 in the container material 3 are cut into circular arcs with a predetermined radius. The corner portions are two corner portions corresponding to the shoulders of the container 1 and two corner portions corresponding to the vertices of the triangular pleat portion 9 described above.

[0035] The container material 3, which has the outer joint 8a welded and its contour adjusted by trimming to form a bag shape, is separated for each portion corresponding to one container 1. FIG. 12 shows the container material 3 separated in this way. In this state, since the upper edge ends of the sheet portions 5a, 5b are open without being joined to each other, as shown in FIG. 13, with the spout 4 sandwiched here, the upper edge ends of the sheet portions 5a, 5b and the spout 4 are welded together to close the upper end portion of the container 1. Therefore, the portion surrounded (or closed) by this upper edge, the outer joint 8a described above, and the bottom - equivalent portion 5c becomes the hollow portion 6 for filling the contents.

[0036] When the spout 4 is attached as shown in Fig. 13, the main body portion 5 is in a state where the sheet-like container material 3 is folded, so it does not have a three-dimensional structure or a self-standing structure. In order to obtain a three-dimensional structure or a self-standing structure, air, as an example of a fluid, is blown into the injection hole 11 formed in one fold portion 9. Since the injection hole 11 communicates with the cell 7 through the adhered portion 9a inside the fold portion 9 and the passage 12, the cell 7 expands by air pressure and the whole becomes a three-dimensional structure. In that case, the portion corresponding to the bottom 5c is pushed downward to form a flat or valley-shaped bottom surface that bulges inward of the container, so that it becomes a self-standing structure. After the cell 7 is sufficiently inflated, the passage 12 is closed by welding the films 3a and 3b to each other by heating while sandwiching the portion of the passage 12. Note that the central portion F surrounded by the inner joint portion 8b is closed with respect to the cell 7, so that a smooth and nearly flat surface is maintained.

[0037] In this way, the container material 3 or the container 1 having a three-dimensional structure or a self-standing structure is filled with the content from the spout 4, and a pump-type extrusion device 2 is attached to the spout 4, or other appropriate caps are attached and sealed to obtain a product.

[0038] Note that the present invention is not limited to the above-described embodiments and can be appropriately modified and implemented. For example, the shape and number of the fluid filling chambers (cells) may be arbitrary shapes and numbers depending on design requirements and requirements based on the content. Further, the fold portion can be appropriately formed according to the shape of the container, and an injection hole may be formed in the fold portion. The fold portion is not limited to the corner portion on the bottom side of the container, and may be formed at a so-called shoulder portion or upper edge portion of the container so as not to impair the symmetry of the container shape. Therefore, the shape of the fold portion in the present invention may be an appropriate shape other than a triangular shape.

Explanation of reference numerals

[0039] 1 Container 2 Pump-type extrusion device 2a Cap 2b Nozzle portion 3 Container material 3a, 3b Films 4 Spout 5 Body part 5a, 5b Sheet parts 5c Bottom equivalent part 6 Hollow part 7 Fluid filling chamber (cell) 8a Outer joint part 8b Inner joint part 9 Pleat part 9a Non - adhesive part 10 Compartment joint part 11 Injection hole 12 Passage 13 Flat part 14 Linear welding part 15 Bottom compartment welding part 16 Notch part F Central part L1 Double - fold line L2 Bend line Pc Intersection point

Claims

1. A fluid-filled bag-shaped container having a three-dimensional structure in which sheet-like container materials formed by laminating films are stacked, each having a fluid-filled chamber that maintains its shape by being filled with and inflated with a fluid, and at least the peripheral portions of the stacked container materials are joined to each other to form a hollow portion for containing contents therein, a partition joint portion that linearly joins the container materials stacked on each other so as to form the hollow portion, a pleat portion provided separately from the portion that becomes the outer wall portion of the hollow portion and is divided by the partition joint portion from the portion that becomes the outer wall portion of the hollow portion among the container materials, a closed non-adhesive portion formed by making the laminated films non-adhesive at the central portion of the pleat portion, an injection hole formed by opening into the non-adhesive portion in one of the laminated films forming the pleat portion, a passage that penetrates the partition joint portion separating the pleat portion and the fluid-filled chamber and communicates with the non-adhesive portion, and is closed in an airtight state when the fluid-filled chamber is filled with the fluid, and characterized by comprising the above.

2. The fluid-filled bag-shaped container according to claim 1, wherein the container material includes a first sheet portion and a second sheet portion each having the fluid-filled chamber and facing each other, a part of the peripheral portion of at least one of the first sheet portion and the second sheet portion is bent at a predetermined position on the peripheral edge of the one sheet portion as a bending point and bulges outward from the hollow portion at the bending point, and both sides of a predetermined length sandwiching the bending point of the peripheral edge are aligned and joined to each other, and a part of the peripheral portion is joined along a line connecting a portion of a predetermined length from the bending point on the bending line passing through the bending point and the joined portion of the predetermined length, and the portion joined along the line becomes the partition joint portion and the pleat portion is formed. A fluid-filled bag-shaped container, characterized in that...

3. The fluid-filled bag-shaped container according to Claim 2, wherein the first sheet portion is formed by one half of the single container material that is folded in two, and the second sheet portion is formed by the other half; a folding point is provided at a location a predetermined length away from the bottom-side apex portion, which is the folded portion of the container material, among the peripheral portions of the first sheet portion and the second sheet portion, and the portions of the lengths from both sides of the folding point to the bottom-side apex portion are made into the portions of the predetermined length; a joined portion along a line connecting the bottom-side apex portion and the portion of the predetermined length on the folding line passing through each folding point in the first sheet portion and the second sheet portion becomes the partition joining portion, and the pleat portion is formed by the partition joining portion, the folding line, and the peripheral portion; a portion partitioned by a line connecting the intersection points of the partition joining portion and the folding line in the first sheet portion and the second sheet portion and each folding line as four sides constitutes the bottom surface portion. A fluid-filled bag-shaped container, characterized in that...

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